The Sydney CBD was reminiscent of a 'disaster zone' in the early hours of Saturday morning after the city was forced into lockdown after a major gas leak.
The Daily Telegraph is reporting the leak occurred when construction workers unfortunately hit a major gas pipe located under a thin layer of asphalt.
There are a number of road closures around the CBD with motorists asked to avoid the area.
Martin Place train station is also a "no go zone" with trains diverting to other city circle stations.
City goers reported hearing a loud noise and subsequent strong smell around 11:30pm last night with Superintendent Paul Johnstone from Fire and Rescue NSW telling Channel 9's Today Show air monitoring since the incident has found 'explosive levels of gas'.
"The fire crews on the scene did some air monitoring around the area and found dangerous, explosive levels of gas," he said.
"We had to set up this 200-metre exclusion zone and we've continued to monitor the area through the night."